Which instrument provides a direct reading of the acidity or basicity of water?

• A. HAZMATID Elite
• B. Dippers
• C. A pH meter
• D. Kemmerer bottles

Answer: (C)

Measuring acidity or basicity in water is about determining the pH, which reflects hydrogen ion activity in the solution. A pH meter gives a direct numerical reading of this value by using a glass electrode along with a reference electrode to sense the voltage related to hydrogen ions; the meter then converts that signal into a pH number, often with temperature compensation for accuracy. This direct readout is what makes it the best choice for assessing whether water is acidic (pH below 7), neutral (pH about 7), or basic (pH above 7).

The other tools don’t provide a direct pH reading: sampling devices like dippers and Kemmerer bottles are used to collect water samples for later analysis, not to measure pH on the spot. The HAZMATID Elite is used for identifying hazardous materials, not for measuring water chemistry.